The son, Yu Yi-lap (Kaho Hung) and his father (Ko Hon Man) are bonded flesh and blood, but are estranged from each other. One day after an accident, the two bodies swapped and they are forced adapting to the other’s life.

The principal (Helen Law) from Yi-lap’s school makes him pursue a long-awaited music dream that she couldn’t achieve before her retirement. Yi-lap and his father have to work together on this music journey and their relationship reconciles through the way.