The Jingcherng metalwork and design studio, on the verge of bankruptcy, is sold to a new director, Jin Yu Zhen, who is reputed to be an excellent manager. On his first day at work, the austere and unapproachable new director shatters morale among the team of designers by introducing the Single Rule, prohibiting employees from having romantic relationships of any kind, even marriage, on pain of dismissal. The rebellious employees collude in a plan to snoop on director's own private life, hoping to find leverage to get the rule abolished. As team leader, Shi Lei is best placed for the unappealing job of getting close to the tyrant director and learning what makes him tick. Shi Lei is not, however, prepared for the traumatic past hidden under Jin Yu Zhen's stony exterior, or for the unexpected stirrings of his own heart.