Left out by Sang-hak and Sang-yeon's secret, Eun-jung feels alone and adrift — until heartbreak and hardship scatter all three in different directions.

In 1992, Ryu Eun-jung clashes with new student Cheon Sang-yeon out of envy. Years later, Sang-yeon returns with news of her illness — and a final request.

Upon rejecting Sang-yeon's request, Eun-jung revisits their past — from her complex friendship to her fondness for Cheon Sang-hak, Sang-yeon's brother.

Eun-jung meets Kim Sang-hak in her college photography club — a man who shares a name with someone from her past. Her timidness soon turns things awkward.

After years of no contact, Eun-jung and Sang-yeon meet again in college. But old shadows of insecurity soon resurface — rekindling old pain between them.

Sang-hak's enlistment sparks distance — for Eun-jung, ignored calls and secrets online begin to emerge, putting her friendship with Sang-yeon in danger.

Sang-yeon and Sang-hak grow closer as they bond over her brother, and Eun-jung's suspicions grow — leading her to a truth that changes how she sees them.

Now a film producer, Eun-jung crosses paths with Sang-hak once again — but when disastrous news hits their project, Sang-yeon reappears.

As filming begins, Eun-jung and Sang-yeon clash over scripts, budgets, and creative style — while both hope to land Sang-hak as their cinematographer.

A remote location scout leaves Eun-jung and Sang-yeon isolated, and small setbacks and creative clashes spiral into an unresolved, tense standoff.

After their friendship ends in anger, Eun-jung shuts Sang-yeon out for good. Years later, Sang-yeon returns, hoping Eun-jung will grant her last wish.

After Eun-jung confronts her about Sang-hak, Sang-yeon tries to ease the tension — but soon discovers a shattering secret about her brother.

An on-set accident puts filming in jeopardy. Eun-jung and Sang-yeon must pull together to keep the project on track — relying on Sang-hak's expertise.

Sang-yeon's resentment for Eun-jung boils over, just as a violent on-set crisis throws the production — and their partnership — into chaos.

As Sang-yeon nears her final journey, Eun-jung grapples with a difficult promise. On the eve of goodbye, they share memories from a lifetime of friendship.