Jeongin is a kindergarten teacher loved by both children and their parents. But no job is perfect, and there are many difficulties that one needs to face. Jeongin thought he saw everything, but a new boy that got into his class has become his new "difficulty." The young woman that was bringing and taking the boy, Kim Binna, had to come in one day for a meeting, revealing the boy's life story to the young teacher. Now, they both take on the mission to help the child become a happy and cheerful boy. But all that darkness his little self is holding starts to affect the teacher too. In the end, everyone needs help... And a warm hug. TW for depression

Park Ara, the college sunshine loved by many, is sent on a difficult mission - to bring the closed-off, grumpy Kim Seungmin back to school. She knows it's a challenging task but she takes it head-on, all with a smile on her face. But, just how will she get this boy to warm up to her when he doesn't trust anyone, when he's deflecting and continuously rejecting her warmth and care? Seungmin x fem!OC - grumpy x sunshine trope TW for angst, illness, depression