The heroine, who has lived in a greenhouse since childhood, has a lively and cheerful personality. Her smile is like the warm sunshine in winter, and these are given to her because she has a family who loves her and a childhood sweetheart. However, on her 20th birthday, which was also the eve of her engagement party, she unexpectedly discovered Discovering that her biological sister was actually pregnant with her fiancé's flesh and blood, she was so angry that she decided to pick up the things she had abandoned for that heartless man. She picked up her suitcase without hesitation and got on a plane flying to South Korea the next day. From that point on, her life changed drastically. . . .