What bothered me about this season wasn't that she ended up with the second lead, but that there was so many unnecessary parts to this season.

There was a murderer for some reason that was used as a vehicle to let Jojo come to terms with her past and her true feelings for Hye-yeong. However, I believe she could have figured it out with there being a murderer inspired by her drawings.

Sun-oh's endgame relationship was not needed as it seemed like they just wanted him to end up with somebody so the viewers would be satisfied but it was rushed and awkward.

The inclusion of Hye-yeong's father being in prison was also unnecessary and didn't add anything to the plot whatsoever.

Overall the only reason for the second season was to find out who Jojo decides was the best option for her which would not have been enough for a whole season so they added in whatever they wanted