Adopted son Lin Cheng'an is ennobled and holds a grand wedding, yet turns his adoptive father Lin Zhenshan away at the door. To protect her grandfather, Lin Wan smashes the wedding hall. Upon investigation, she exposes Lin Cheng'an for fraudulently claiming military merit for saving the emperor, and further unearths the old palace fire case from twenty years ago. It turns out she is actually the missing eldest imperial daughter. Facing the palace usurpation by Prince Kang and Han Chong, Lin Wan uses ironclad evidence to overturn the case and settle scores with her enemies, finally allowing her adoptive father to wash away the false charge of treason and return home with dignity.