At his daughter's wedding, her father, who had been missing for five years, suddenly bursts in and declares that the banquet hall will collapse in three minutes! Everyone thinks he has come to cause trouble, but he risks his life to save more than a thousand guests. Beneath his gray work clothes lies the identity of a chief engineer. Behind five years of silence is a truth that has been concealed. When his supposedly deceased wife reappears, the secrets behind this wealthy family's wedding gradually come to light. Faced with an even greater crisis, the family joins hands to protect lives. This time, can he clear his name, regain his daughter's trust, and restore the family they have long been without?