The Undertakers Season 1

One day, a high school girls Si-eun commits suicide. Undertaker, Sang-jo takes over her body, That night, Some robber steals ring from her body's finger. From then, a lot of scary cases happen. Sang-jo felt strangely that Si eun's family are going to finish her funeral in a hurry, so he investigates her suicide. He meets Si-eun's friend by chance and hears a lot about Si-eun from her.

That ring 's sold to Sieun's classmate in the secondhand market. She see Si-eun's ghost every night and suffers from fear,too. Sang-jo finds out that she fell in love with teacher and she died pregnant. Sang-jo blamed him but he denied their relationship. After a while, that teacher was found crazy ,wearing the same ring as her.What 's the secret of the ring? Why did she commit suicide?