Lee Sung-yeon — What's Wrong with Secretary Kim Character Profile

About Lee Sung-yeon

Vice Chairman and Lee Young-joon's cousin, characterized by a confident exterior, a comedic personality, and unrequited feelings for Kim Mi-so.

Character Facts

Played by

Lee Tae-hwan

Appears in

What's Wrong with Secretary Kim (2018)

Role

Supporting

Relationships (2)

• Lee Sung-yeon — Brothers / Rivals — Lee Young-joon (Park Seo-jun)

  Complex sibling relationship marked by estrangement, romantic rivalry, and eventual reconciliation over hidden family secrets.

• Lee Sung-yeon — Childhood Friends / Misidentified Saviors — Kim Mi-so (Park Min-young)

  Platonic connection rooted in a shared traumatic past, initially mistaken for romantic potential before clarifying into friendship.

Explore the full interactive character relationship map of What's Wrong with Secretary Kim

More characters from What's Wrong with Secretary Kim

• Lee Young-joon (Park Seo-jun)
• Kim Mi-so (Park Min-young)
• Kim Ji-a (Pyo Ye-jin)
• Jung Chi-in (Lee Yoo-jun)
• Madame Choi (Kim Hye-ok)
• Kim Mal-hee (Heo Soon-mi)
• CEO Lee (Kim Byeong-ok)
• Kim Pil-nam (Baek Eun-hae)
• Young Kim Mi-so (Kim Ji-Yu)
• Lee Young-joon / Lee Sung-hyun (Moon Woo-jin)
• Young Lee Sung-yeon (Bae Gang-Yoo)
• Park Joon-hwan (Kim Jung-woon)