Original Manhua:
KuaiKan, BiliBili, IQIYI

Official Translations:
Japanese

Note:
Based on the Novel "Binding the Dragon for the Empress" by Shuzai

To save his empress, the emperor dived deep into the thousand year lake without thinking about his own safety. In the lake, he tricked a Xuan Long who was abandoned by his tribe to go to the palace and coaxed the Xuan Long to give him his heart. As a result of the frequent courting of the emperor, the Xuan Long sincerely fell in love with him. But in the end, he was harmed to death by the emperor, and disappeared like ashes after giving birth to a dragon. At this moment, the emperor got back the memories of his past life and discovered that the person he had personally killed was his lover, the one who he had been searching for thousands of years.