How Lee Joo-yeon Transforms ‘Your Brilliant Season’ with Her Intriguing Character: A Deep Dive

Daniel Kim | 2026.03.29

Translation result.Lee Ju-yeon delivers a layered, incisive performance as Cha Soo-jin — the character holding the key to a hidden truth — and effectively drives the series’ mounting tension. In the MBC Friday–Saturday drama In Your Radiant Season, episodes that aired on the 27th and 28th saw her upend the narrative surrounding a Boston incident from seven years ago that connects her to Seon Woo-chan (played by Chae Jong-hyup). Previously, Cha Soo-jin was revealed as the figure tied to the “bracelet sound” in Seon Woo-chan’s memories, a twist that deepens both the mystery and the emotional stakes.