Luck Key
럭키 (original)
Hyung-wook, an infamous assassin known for his perfection, slips on soap at a public sauna and passes out. Jae-sung, a not famous unknown actor, witnesses the accident and switches his locker key with Hyung-wook's. Jae-sung opens the locker to find the key to a fancy car which leads him to a luxurious condo. On the other hand, Hyung-wook wakes up with amnesia.
Starring Yoo Hae-jin, Lee Joon, Jo Yoon-hee, Lim Ji-yeon, Jo Han-chul, Kim Min-sang, Cha Yup, Kim Ji An, Seong Byeong-sook, Go Joon
Watch "Luck Key" from streaming services Tubi TV, Roku Channel, Plex Free released in 2016. It's a action & adventure and comedy movie, and has a rating of 6.9 out of 10 from Imdb which is usually fine for this kind of movie, and is currently available to watch for free.