All couples in this drama (spoilers)

Main couple

Goo young shik (PSH) x Hwang tae hee (KNJ)                                                                    The 2nd lead PSH gets more screentime than the main male lead after episode 10 and also gets the main girl

Bong jun soo (JJH) x Baek yeo jin (CJA)

Side couples

Kang woo x So yoo kyoung

ki ppeum x kang dang won

I'm posting this type of list in every drama i watch, so that it will help the people who are curious to know before watching (like me ;)).

just reply with a thanks if it helps :).