Zhou Xiao tries to start a detective club. Fanzhou joins to stay close to her, despite his cold exterior.

Zhou Xiao becomes Fanzhou's lab assistant. Their proximity leads to accidental physical closeness and sparks.

News of Fanzhou helping Zhou Xiao spreads. He realizes he is falling for her energetic and quirky nature.

When a childhood friend appears for Zhou Xiao, Fanzhou experiences unfamiliar feelings of jealousy and rivalry.

Fanzhou decides to pursue Zhou Xiao systematically, using "equations" of love to win her heart.

The two go on their first official date. It's awkward yet sweet as Fanzhou steps out of his comfort zone.

Fanzhou officially asks Zhou Xiao to be his girlfriend. She happily agrees, starting their sweet romance.

Amidst their studies, the couple shares a tender first kiss, solidifying their commitment to each other.

Fanzhou's mother's mental health issues are revealed, casting a shadow over his happiness with Zhou Xiao.

Fanzhou tries to hide his family struggles from Zhou Xiao, causing a small rift in their communication.

Fearing his family situation will burden Zhou Xiao, Fanzhou makes the painful decision to break up with her.

Time passes. Zhou Xiao is working on her novel while Fanzhou focuses on his forensic studies, both miserable.

Destiny brings them back together. Fanzhou realizes he cannot live without Zhou Xiao and seeks her forgiveness.

Fanzhou begins a relentless pursuit to regain Zhou Xiao's trust, proving he won't run away again.

Zhou Xiao sees Fanzhou's sincerity. They reconcile, promising to face all future hardships as a team.

The couple supports each other through internships and graduation stress, balancing love and ambition.

Zhou Xiao introduces Fanzhou to her parents. His intelligence and devotion eventually win them over.

Fanzhou introduces Zhou Xiao to his mother, marking a huge step in overcoming his personal trauma.

Graduation arrives. Fanzhou and Zhou Xiao look toward a bright future together, solving the equation of love.

In a sweet epilogue, the couple finds their "happy ever after," proving love is the most beautiful variable.

A look at the supporting couples' journeys, showing how they all found their own version of happiness.

A collection of sweet moments and bloopers from the university days of Fanzhou and Zhou Xiao.

A final montage of the couple's best moments, celebrating their enduring and sweet love story.

Bonus scenes featuring the Detective Club's final gathering and the group's lasting friendship.

A glimpse into their domestic life, showing that their love story continues to thrive years later.

Recapping the journey from the train station to the present, highlighting how much they have grown.