Sheng Shao You was kidnapped and injected with a deadly toxin. To save him, Hua Yong had no choice but to mark him permanently as Enigma. After the marking, the two become passionate and Shao You makes a confession. Meanwhile, Gao Tu makes a decision to resign, triggering misunderstanding and anger from Shen Wen Lang.

The relationship between Sheng Shaoyou and Hua Yong heats up rapidly. However, Sheng Shaoyou's younger brother Sheng Shaoqing has ulterior motives which forces Hua Yong to protect his beloved.