Kim Namjoon, 20. The hyung who hard carries the whole family. The one who often gets stressed out after work and studies but still cares for his younger brothers a lot. Jeon Wonwoo, 18. The middle one who is kind-hearted, but sometimes too emotional and needs to be protected. Lee Chan, 16. The youngest dongsaeng who is innocent and childish, and always there to cheer his brothers up.

Fate makes them destined to be together, to be the most important person of each other. It may be strange but yes they are brothers. Somehow each of them faced a lot of problems in life, but they always know that they are definitely not alone.