The story of the gentle brother who cannot stand and the naughty younger brother who is full of energy is told in sequence. Because my brother was born unable to stand, his parents decided to have another child. The parents are too busy, and the older brother, who has grown into a teenager, needs to take care of the younger brother who is still just an infant. Gradually, the younger brother became more and more dependent on his older brother. As the younger brother grows up, family changes, the death of his mother, and his brother's serious illness occur one after another. Can the two of them overcome one difficulty after another together? After the breakup and twists and turns, can the two recognize their feelings for each other? Is it possible to overcome the worldly perspective? In the end, who is relying on whom?