As of the end of episode 4, I am so hoping it will be Jung Ji Ho, but........
If it follows the traditional trope, she will pick neither, because JJH is not quite ready or rather wants her to experience dating on her own or something trite like that. She will leave for Canada in the beginning of the last episode, be there for 1 to 3 to 7 yrs, then come back and in the last 2 to 5 mins of the last episode JJH and CSE will confess their feelings to each other and kiss and end scene.
Hopefully, whomever she ends up with it will be well worth watching the drama to get to that point.