In the webtoon the ending was very sad because i want sunjojo together .
Sun Oh is the most logical choice because she is in love with him still and he is in love with her. Although I would feel bad for Hye Yeong, he actually waited to late. Hye Yeong had plenty of opportunities to ask Kim Jojo out but he never did and she met his friend Sun Oh and the rest is history so I feel he missed his opportunity.
Now, Sun Oh and Jojo have MAJOR chemistry together and they fit together because of their tragic childhoods and grappling with the feeling of being unloved. I feel like Sun Oh and Jojo need each other. What I love about Sun Oh is how he never hesitates to tell JoJo how much he likes her and wants to be with her. Sun Oh has been upfront about his feelings from the beginning.
Sun Oh is who we hope she ends up with in the Drama. If Sun Oh and Jojo dont end up together then there is basically no justice in K drama land.