What actors and actresses appeared in The Night Owl - 2005?

The film you are asking about is likely "The Night Owl" (2018), not "The Night Owl" (2005). There is no known film with that title released in 2005.

If you are interested in the cast of the 2018 film "The Night Owl", here are the main actors:

* Ryu Seung-ryong as King Yeongjo

* Kim Myung-gon as Heo Suk

* Yoo Hae-jin as Lee Song-yeon

* Kim Seol-hyun as Choi Sang-pal

* Son Eun-seo as Kim Hwa-kyung

Please clarify which film you are referring to if you meant a different one.