If you don't like Emma here, I wonder what's going to be your reaction on Yuna in LCC.
Honestly no idea. I haven't tried LCC and not sure yet if and when I will.
I feel really sorry for Emma, my heart broke for Emy and what she went through, but Emma hasn't shown the MC any remorse or offered any appology, in fact we did the opposite by continuing to call him Piggy when she arrived. All that discounts any feelings she has for him as you don't treat someone you love like that no matter the circumstances. And each day that goes by without her telling the MC who she is makes me like her less and makes it harder to forgive her.
Personally in that situation, I would find her hiding that from me and not telling me she was Emy far worse more unforgivable than any bullying she did at school. The bullying I see has horrible and mean, the not telling me who she is
I see as betrayal especially if she claims to love me.
So if Yuna is like that... supposedly loving the MC and doing something to hurt him or lie to him or sleeping with someone else (even another LI) then I'd hate her.