Yumi’s Cells’ three male leads: Goo Woong, Yoo Babi, Shin Soonrok — Yumi ends up falling for a younger guy because she finally chooses to love herself

Over the three seasons of “Yumi’s Cells,” Yumi, played by Kim Go-eun, dates Goo Woong (Ahn Bo-hyun) and Yoo Babi (Park Jinyoung) before ultimately ending up with the younger Shin Soonrok. The heart of these three relationships was never about “who was better,” but about Yumi gradually learning to recognize the most honest voice in her heart through each one. That voice is the answer she finally arrives at after three seasons.

• Related reading:Finally: “Yumi’s Cells 3” premieres in April, and the stills of Kim Go-eun with younger co-star Kim Jae-won are enough to make your heart flutter!

No one is born knowing how to be in a relationship.

At the start of every relationship, you think this time will be different. When each one ends, you realize that somewhere along the way, you quietly tucked a part of yourself into a corner.

Over three seasons, “Yumi’s Cells” captures this more accurately than any psychology book. Kim Go-eun’s Yumi goes through three relationships, each bringing gains and losses. Only when she looks back does she realize that those losses were the signposts that ultimately led her back to herself.

Goo Woong: The Feeling That Made Her Think She’d Found the Answer

Before meeting Goo Woong, it had been a long time since Yumi’s heart had raced.

Her life wasn’t bad; she was just numb. Work, eat, sleep, repeat. The days passed, yet there was nothing she could really look forward to. Many people have been in that state. It’s not bad, just empty.

Then Goo Woong came along.

The way he made her heart race was almost a shock to Yumi. It was the surprise of realizing, “I can still feel this way,” the jolt of emotions long asleep suddenly waking up. Her love cell was screaming, while her rational cell couldn’t get a word in.

Yumi’s state of mind at the time is easy to understand: when rain finally comes after a long drought, you can’t help mistaking it for forever.

Goo Woong is still a kid, and he knows it. He loves Yumi sincerely, yet he isn’t mature enough to sustain a real relationship. When things get difficult, he runs away. When faced with conflict, he doesn’t know how to handle it. More importantly, he never seriously asks Yumi, “What do you want most in your heart?”

This relationship teaches Yumi one thing: a racing heart is where love begins, not where it ends. Feeling lit up is precious, yet if the other person can only spark that feeling and can’t stay by your side to keep the fire going, it will eventually burn out.

Have you ever known someone like that? Someone who makes you feel alive again, yet ends up hurting you the most. That’s the role Goo Woong plays. He wakes Yumi’s cells, yet he can’t make her whole.

Babi: She Thought She Was Still in Love, Until She Realized She Felt Calm

Yoo Babi is almost everyone’s idea of the perfect boyfriend.

He works at a food company and is steady, gentle, and attentive. He remembers every detail and knows what to say at the right moment. He even understands “the way women talk.” That kind of sensitivity is rare in real life. With him, Yumi feels safe and truly cherished.

Later, Yoo Babi is transferred to Jeju Island and promoted to team leader, adding another layer of difficulty to their relationship. During this time, he gradually develops feelings for a younger intern at the company, Yoo Da-eun.

Yumi finds out.

By all rights, this should have been the moment she fell apart. Yet Yumi ultimately says something that leaves many viewers silent:

“How could someone who’s fallen in love possibly feel calm?”

When she sees it all, she feels calm inside. Not because she has already forgiven him, but because that love had quietly drifted away at some point without her noticing. She doesn’t even know when it began. She only knows that her calm gave her the answer more honestly than any betrayal could.

That’s the real reason Yumi breaks up with him. It’s not because Yoo Babi did something unforgivable, but because she realizes her love for him is no longer deep enough to make her fall apart in that moment.

They briefly get back together afterward, yet the two still reach the end of the road. Sometime before Christmas, Yumi receives a message from him saying he is spending the holidays somewhere tropical. It turns out he has been transferred to Singapore. Before leaving, he also quietly helps Yumi recover three weeks’ worth of writing she had lost. And just like that, a relationship quietly comes to an end with a holiday text.

This kind of ending is hard for many people to fully process. Yoo Babi isn’t a bad person, and the relationship wasn’t without its happy moments. Yet some relationships are like that: they can be good, serious, and whole, then quietly fade when you’re least expecting it.

Have you ever felt this way? One day, you suddenly realize that your heart no longer races when you’re with that person. It’s not hatred or sadness, just calm. That calm is the quietest kind of goodbye.

Shin Soonrok: She Never Expected Him to Make Everything Feel Right

By season three, Yumi is already a bestselling novelist.

She’s made it. Her writer cell is fully awake, her book has been published, readers love her stories, and her life is stable and orderly. By all rights, this should be her best state, yet her other cells begin falling asleep one by one.

The numbness that comes after success is harder to notice than the numbness that follows failure, because you can’t find a reason to say you’re unhappy.

Then Shin Soonrok appears.

He is an editor at a publishing house who takes over as Yumi’s editor. Her first impression is that he’s cold. In public, he is the classic man with walls up: he doesn’t say much or show much reaction, and he handles work and relationships with clean-cut efficiency, making him seem difficult to approach.

Yet he has an unexpected ON/OFF switch.

Once he closes his front door, he is a completely different person. It’s as if he takes off that coolness and sense of distance like a coat, leaving someone who can relax over everyday things and doesn’t need to keep his guard up. That contrast surprises many people, yet it’s also what makes him so captivating: you realize you’re seeing a side of him that others rarely get to see.

Yumi and Shin Soonrok’s relationship doesn’t begin with fireworks.

It’s the silence in the elevator, the emoji he uses to reply to her birthday wishes, and the moments he takes for granted that somehow make Yumi’s heart skip a beat. He doesn’t make a deliberate move or shower her with sweet words, yet feelings quietly find their way in.

In the end, it’s Shin Soonrok who wakes Yumi’s love cell again.

Not because he’s the most romantic or understands her best, but because feeling cared for by him pulls her out of her post-success numbness in a way she never expected.

Many people have been in this place: you think you no longer need love, that your life is good enough, and that you don’t want to put yourself through any more upheaval. Then someone comes along and makes you realize what that “good enough” has been missing.

For Yumi, Shin Soonrok is the person who makes her realize, “I wasn’t asleep after all.”

Yumi’s story isn’t about romance. It’s about your relationship with yourself and how to understand your own heart.

After following all three seasons, you realize that what “Yumi’s Cells” really wants to say isn’t simply about which man is better.

It’s asking: Have you learned to understand the most honest voice in your heart through a relationship?

Goo Woong teaches Yumi that a racing heart is real, yet it doesn’t mean it’s right. Yoo Babi teaches her an even deeper lesson. That line, “How could someone who’s fallen in love possibly feel calm?” isn’t really judging him. It’s the first time Yumi honestly faces her own heart. She doesn’t choose to convince herself to keep loving him, nor does she pretend that calm isn’t there. She chooses to trust the answer that calm gives her.

That’s the hardest thing of all.

Because in relationships, we’re so used to ignoring the small signals in our hearts. We’re so used to saying, “Maybe I’m too sensitive,” “Maybe things will get better if I wait a little longer,” or “Maybe I should try harder.” Yumi was the same. Yet in the end, she listened to that most honest voice.

Shin Soonrok’s arrival offers another kind of lesson. It doesn’t teach her how to choose; it lets her discover that the door she thought she had shut was really only slightly ajar. Numbness after success isn’t the end, but a beginning she isn’t ready for yet.

Everyone has a “love cell” and a “writer cell” inside them. They may go by different names, yet they refer to the same thing: the truest, most essential part of yourself, the part least willing to shortchange itself.

Sometimes it wakes up in a relationship; sometimes it quietly falls asleep in one. Sometimes you think it no longer needs waking, only to find that it has simply been waiting for someone you never expected.

Over three seasons, Yumi has three relationships, and each one helps her understand herself more clearly. She doesn’t find the best man; she finds her most honest self.

And that most honest self is the most important character in all her love stories.

Join POPBEE Circle and subscribe to the POPBEE newsletter for the latest updates, and be the first to learn about exclusive perks and discounts! Beyond this article, here are a few recent stories worth keeping an eye on: