༄ Double roles ༄

Gun plays a pair of twins. Amazing!

Um... it's complicated and heartbreaking T T

Wang Duo plays Qingmings master as well as Qingmings masters  guardian spirit.

Big Spoiler!  ML is a Kawas as well Kakarayan.

FL as twinsisters

FL travels back in time and meets her younger self

ML as Human and Hologram, two opposite personalities

One of ML has an evil doubleganger, not related. 

Yoon Shi Yoon's character in the present meets his past self.

Jin Goo plays two opposite people. Good and evil double ganger.

Yoon Shi Yoon takes a role of a twin pair with a lot of conflicts.

Zhu Yi Long mesmerises  in a 'good brother fights the evil brother who wants to destroy the world' role (the evil twin brother is really creepy)

Yang Se Jong is being hunted by his evil self.  One of them is a clone. (Love clone plots!)

Lee Je Hoon travels back and forth between past and present, never really confronting his former self but existing at the same time with different mind sets, communicating through written word.

Damn I hated and loved Seo Kang Joon here.  One is a nice cyborg copy of a messed up chaebol.

Yang Mi plays her character triple time. I know! Its awesome! Different time lines characters come together!

Seo In Guk plays a  high school student with a mysterious older twin brother who is a buisenessman