Character Relationship Map: Architecture 101

Characters

• Lee Seung-min (played by Uhm Tae-woong) — protagonist

  Lee Seung-min is an architect in the present day who is asked by Yang Seo-yeon to design a new house on Jeju Island. Their collaboration revives memories of their college romance, but he ultimately ch...

• Yang Seo-yeon (played by Han Ga-in) — protagonist

  Yang Seo-yeon approaches Lee Seung-min to rebuild and expand her family's old Jeju house. While caring for her dying father, she spends extensive time with Seung-min and rekindles memories of their fi...

• Seo-yeon's Father (played by Lee Seung-ho) — supporting

  Seo-yeon's Father is the dying parent of Yang Seo-yeon in the present-day storyline. Seo-yeon cares for him while Lee Seung-min works on renovating the family's old Jeju house, placing her renewed con...

• Jae-wook (played by Yoo Yeon-seok) — supporting

  Jae-wook is a wealthy student known to Young Lee Seung-min and Young Yang Seo-yeon at college. Young Seo-yeon likes him, making him a source of jealousy and insecurity for Seung-min; Seung-min later s...

• Eun-chae (played by Go Joon-hee) — supporting

  Eun-chae is Lee Seung-min's fiancée in the present day. She becomes increasingly annoyed by the time Seung-min spends with Yang Seo-yeon on Jeju, but Seung-min ultimately chooses their planned future...

• Seung-min's Mother (played by Kim Dong-ju) — supporting

Canonical Relationships

Family, romantic, and professional connections based on plot evidence.

• Seo-yeon's Father → Yang Seo-yeon (father)
• Seung-min's Mother → Lee Seung-min (mother)
• Lee Seung-min → Eun-chae (Romantic Fiance) — Eun-chae is Seung-min's present romantic commitment.

  Seung-min is engaged to Eun-chae, plans to marry her, and is preparing to move with her to the United States.

• Lee Seung-min → Yang Seo-yeon (Romantic Former Love Interest) — Their past affection remains emotionally significant despite their separation.

  They met in an architecture class, developed mutual but unspoken feelings, and their unresolved first love shapes their reunion seventeen years later.

• Yang Seo-yeon → Jae-wook (Romantic Interest) — Jae-wook represents the romantic obstacle that wounded Seung-min's early feelings.

  Seung-min remembers that Seo-yeon liked the wealthy student Jae-wook, and he later sees Jae-wook entering Seo-yeon's house with her while she is drunk...

Story Dynamics

Alliances, conflicts, and narrative interactions that evolve throughout the story.

• Lee Seung-min → Jae-wook (Conflict Romantic Rival) — Jae-wook's presence intensifies Seung-min's jealousy and emotional hesitation.

  Seung-min is unable to confess his attraction to Seo-yeon while remembering her interest in Jae-wook and witnessing them enter her house together.

• Eun-chae → Yang Seo-yeon (Conflict Romantic Rival) — Seo-yeon's renewed closeness with Seung-min creates tension around Eun-chae's engagement.

  Eun-chae becomes increasingly annoyed by the amount of time Seung-min spends with Seo-yeon in Jeju.

Story Analysis

A reunion over architecture revives a first love that must ultimately yield to the choices of the present.

Plot Progression

1. An Unexpected Commission — Seo-yeon unexpectedly returns to Seung-min's life and asks him to design her Jeju house. Their professional reunion quickly revives unresolved emotional tension.
2. Jeju And Old Feelings — The renovation forces Seung-min and Seo-yeon to spend extended time together. Eun-chae notices the growing closeness while Seo-yeon's family responsibilities add emotional weight.
3. The Memory Of First Love — The present-day collaboration unlocks memories of their college years, shared neighborhood, and unspoken attraction. Seung-min recalls how Jae-wook complicated his hopes.
4. The Snowy Misunderstanding — Seung-min plans to confess his feelings at the abandoned house on the first snow. After seeing Seo-yeon with Jae-wook, he fails to meet her when she waits alone.
5. A House Of Bittersweet Memory — Seung-min returns the forgotten CD player and reveals that he remembered their promise. He nevertheless chooses Eun-chae, leaving Seo-yeon alone with the completed house and their music.