i read ahead and wtf mo yun is so much better as the FL if you ask me. MC and mo yun travel together for a bit and after completing her goal mo yun leaves and thanks the mc for protecting her. she herself knows that although she'll get stronger if she tags along with the mc she'll just be like a flower in a greenhouse. a million times better than the MC's girlfriend the FL (they already have feelings for each other during this part)
She does try to help when she can to not be such a tag-a-long. He doesn't mind her, which means she's got the right personality, and we can see she isn't one of them toxic types as she tries to do things without him beforehand. There will be times she'll be on her own to try and prove she isn't a wallflower in this sense where she's fed her levels and such.
unfortunately, i think she's the FL and she isnt going away in the near future. in the novel because they're a bit more intimate there and during this part mc blushes a few times when she does something i dont mind the romance but i wish the author didnt make it look like she's just a leech. most of his points are halved because of her. he doesnt even solo any of the dungeons in the near future because she joins him everytime.