Lim Jooin is a 23-year-old college student and vice-president of the Architecture Department, appointed by his classmate and friend, Seo Yeonho. He is the central protagonist of Yours to Claim. Not standing out much, he sees himself as just an ordinary person wanting to live an ordinary life. However, things take a turn when two men come into his life once more — The popular yet cold Ex-president of the Architecture Department, Go Yahwi, and a friendly yet strange foreigner he meets by chance who claims to know him from a distant past, Cain. He's known as gentle and hardworking, but can be stubborn and wears his heart on his sleeve.