On the surface, he is the young owner and shopkeeper of this small and medium-sized pharmacy. Secretly, he is an underground member of the Chinese Communist Party code-named "Night Owl", a nail wedged into the enemy's heart. Deeper in the darkness, he also has another identity - an "Avenger" who was absorbed by the Shanghai Station of Military Reunification using the blood feud of his father (a Kuomintang veteran who was shot for embezzlement of military pay) as a pledge of surrender. Three identities and three faces are like walking on a tightrope on the edge of an abyss. A slight breeze can shatter one's body into pieces.