Lin Shu: 28 years old, a cardiac surgeon who appears to be cold and rational, but actually suffers from mild emotional isolation due to trauma in his native family, and is used to using reason to suppress emotions.
Jiang An: 24 years old, a freelance musician and bar singer. He seems to be an unruly "firework in the world", but in fact he is extremely sensitive to sounds due to his childhood hearing impairment and is lonely inside.
The two met because of an "accidental medical accident" and went from misunderstanding to mutual redemption.
