Yi Heng is an immortal from the Qin Dynasty. He was one of the guardsmen of Qin Shi Huang.
During the Qin dynasty, Heng is deeply in love with his wife, Yi Lin Rui Ling. Heng see Ling died in front of him due to old age.

Heng vows to find Ling in her next lifetime. In between, he also have other relationships. 

As he witnessed all his lovers died, he become numbless towards love. His lovers, disciples and family members left one by one. 

During 1970s, he found a girl, wang Rui fen, resembling Ling and wearing his bracelet, he started following her. Later when he get to know her, he saw a red birth mark resembling the scar when Rui ling stabbed herself. He and fen again became a couple. 

At the end of fen life, she asked heng to bite her neck to leave a mark. She was only 25. She died due to an illness.

Until 2020, Fen recairnate as Zi ling, a girl from Singapore who works in Nanjing. When heng met her again, she already have a boyfriend, Qin bao qiang. Qiang resembles an enemy of Heng. Actually Qiang was Heng best friend, Qin Shi Long, Qin emperor, third son. During the Qin dynasty, Long was fond of Heng, but Heng only treated him as a buddy. To make Heng suffer for his whole life, Long added the immortal pill to Heng wine, which caused Heng to become immortal.
Long was also an inventor to turn back the immortal pill and he also studied on how to relieve qin emperor again.
Heng accidentally knew about his secrets and even found out that he is Long next life!

Chapter 3 - Chapter 3 - A special pill