As a child, An loses his parents in an elevator accident and is adopted by Gu Haowei, moving in with his crush, Jin.

Three years ago, Jin left home. Now, after graduating high school in New York, he returns and reunites with An.

Jin’s mother, thrilled at her son’s return, prepares a welcome party.

The party begins, and rumors about Jin spread among the guests.

On the terrace, An runs into his uncle, who warns him to stay away from the Gu family.

Jin tries to escape the party on a motorcycle, but An stops him...

In the struggle, An gets injured while stopping Jin. Jin’s parents are shocked...

Worried about An, Jin goes to check on him in his room.

Haunted by trauma, An dreams again of the elevator accident.

Late at night, Jin and his parents anxiously wait for An, who hasn’t returned home.

Jin climbs over the terrace to check if An is in his room.

Due to a high fever, An is hospitalized. Jin’s parents argue over the situation.

When An wakes up in the hospital, he worries that he has become a burden to Jin.

An, chosen to give the freshman representative speech at university, fears being late for the ceremony.

Because of his childhood trauma, An has a phobia of elevators, but he faces a situation where he must take one.

Forced to ride the elevator, An suffers in distress. Jin worries for him.

Seeing An still shaken after exiting, Jin pretends to be his older brother to protect him.

Jin asks why An laughed at his words.

At university, An and Jin reunite with their old middle school friends, who question why they went to different high schools.

The friends suspect something between An and Tong, and ask about their relationship.

Seeing a close photo of An and Tong, Jin becomes jealous.

Believing An might be dating Tong, Jin tells him to stay away from him.

When An goes to the rooftop to inform Jin about attendance checks, he overhears Jin and his friends talking.

To side with Jin, his friends badmouth An in front of him.

After class, Jin says he has somewhere to go and sends An home first.

Following Jin, An sees him hugging someone else.

Upset, An drinks, and once again Jin climbs the terrace to see him.

Excited by An’s words the night before, Jin eagerly waits for him to wake up.

Seeing An act as if he forgot last night, Jin consults Ran.

Meeting Tong, An asks if he regrets following someone he loved into physical education studies.

Worried, Jin asks An whom he met after returning home late.

Gu Haowei scolds Jin after seeing his poor grades.

Concerned about Jin’s rebelliousness, his mother calls for An.

She asks An to talk with Jin.

Once again, An follows Jin after class to see where he goes.

At a bar, Jin tries to send An home, but An refuses.

Ran intervenes when he sees An and Jin fighting.

After An skips going home even after his performance, Jin scolds him.

Someone tells An that Jin and Ran are dating, shocking him.

Heartbroken, An drinks the alcohol given to him by someone.

Jin carries the drunken An to his room. An wakes up.

Still drunk, An says something unexpected to Jin.

An wakes up to find Jin sleeping beside him, being unusually gentle.

Gu Haowei sees an article about Jin and Ran’s scandal and asks if it’s true.

Learning that An likes men, Gu Haowei is shocked.

Jin realizes An’s confession wasn’t about him.

Learning that An likes Tong, Jin is consumed by jealousy.

Overwhelmed by jealousy, Jin makes a wrong choice.

Guilt-ridden for hurting An, Jin plans to leave home again.

At his mother’s request, An stops Jin from leaving and persuades him.

An tells Gu Haowei he wants independence, but Gu Haowei tries to hold him back.

Gu Haowei reveals the truth about the elevator accident.

Shocked, An is told by Gu Haowei he will give him anything he wants.

An and Jin move into the dorms. An urges Jin to return home.

When An says he will sever ties with Jin’s family, Jin tells him to take revenge on them.

Jin confesses his long-hidden feelings for An.

Moved, An confesses his own feelings to Jin.

The two confirm their love and share a sweet morning together.

Now closer than before, An and Jin happily share meals at school.

Their friends notice how different they’ve become.

Realizing he wrongly doubted An and Tong, Jin feels guilty.

Haunted by past trauma, An struggles with intimacy with Jin.

An wonders whether to attend Gu Haowei’s birthday party.

An’s uncle visits and reveals the truth about the elevator accident.

He says Gu Haowei adopted An as part of a deal.

An suffers at the thought that Gu Haowei may have killed his parents.

An confronts Gu Haowei, telling him his uncle came.

An suddenly leaves, and Jin asks his mother what happened.

An asks Jin to hold him.

An tells Jin to go back home.

An meets his uncle and asks for CCTV footage.

His uncle tells him to obtain ownership of Happy Group from Jin’s mother.

Friends notice Jin and An sitting separately in class and ask if something happened.

Jin demands to know why An is acting so differently.

His uncle gives An CCTV footage and tells him to use it to pressure Jin’s mother.

An runs away with his uncle’s evidence.

After a car accident, An is hospitalized. Jin asks why he has been acting that way.

An tells Jin about his conversation with Jin’s mother on Gu Haowei’s birthday.

Jin tells Gu Haowei that he loves An.

Four years later, Jin returns from the U.S., and An greets him at the airport.

Jin and An visit An’s parents’ graves together.