Season 1 of My Dearest premiered on August 4, 2023.

Jang-hyun is living without purpose or desire. He's a cold-hearted man who loves no one until he gets introduced to love after meeting Gil-chae. She is charming and admired by all, but her first love, Yeon-jun, is already engaged to her best friend, Eun-ae. Yeon-jun, a Sungkyunkwan student, struggles with his feelings for Gil-chae but cannot break off his engagement due to tradition. Eun-ae does not doubt nor hate the two. As Jang-hyun becomes entangled in this unusual love triangle, Gil-chae, who has only loved Yeon-jun, is confused about her own feelings. The relationship between these four gets put into an even bigger twist at the breakout of war.