Arin from Oh My Girl and Yoon In Soo from "All of Us Are Dead" have officially joined the cast of tvN's upcoming drama "Hwan Hon" (romanized title)!

"Hwan Hon," directed by Park Joon Hwa of "What's Wrong with Secretary Kim," is a fantasy romance drama set in the imaginary nation of Daeho, which does not exist in history or on maps. The drama will follow characters whose lives are turned upside down by a spell that switches people's souls, a process known as "Hwan Hon."

The Hong Sisters (Hong Jung Eun and Hong Mi Ran) are a well-known screenplay team whose past works include the successful dramas "You're Beautiful," "My Girlfriend is a Gumiho," "The Greatest Love," "Master's Sun," "Hotel Del Luna," and more.

Arin will play Jin Cho Yeon, the Jin family's youngest daughter, in the film. Jin Cho Yeon, despite her gorgeous and elegant exterior, is an immature and pure-hearted spirit with a childish innocence.

Yoo In Soo, on the other hand, would portray Park Dang Gu, the heir to a wealthy Daeho family in the top 1%. Despite being the heir to a prominent family, Park Dang Gu is more interested in partying and the different rumors circulating in Daeho than on his business classes.

Lee Jae Wook, Jung So Min, NU'EST's Minhyun, Shin Seung Ho, Yoo Joon Sang, Oh Na Ra, and Jo Jae Yoon join a star-studded cast that includes Lee Jae Wook, Jung So Min, NU'EST's Minhyun, Shin Seung Ho, Yoo Joon Sang, Oh Na Ra, and Jo Jae Yoon.