Su Nian visits her first love, Jiang Yu's, grave. His death after their forced breakup became her lingering regret. She has a fiancé, but past regrets surge, estranging him, while a scheming best friend sows discord. Su Nian discovers Jiang Yu's death was not an accident, but a family conspiracy and malicious concealment. She uncovers the truth, facing a choice between her 'white moonlight' and her present love, reconciling with the past and embracing happiness.
