Mark the soul of someone you love is always a bad idea.
Usually MC(in other stories) think ML love them becuz they're reincarnation of ML's love of the past, not becuz ML love for current them.
If MC(of this manhua) agree to mark contract, then idk what to say. I get the fact ML is a dragon who lived long but you should find other person to love. If not, pray to god to lose your dragon role and be like human to stay with your human lover.
You may like them for their 1st life or 2nd life but starting 3rd and so one, you may get tired explaining the same shts for nth times tbh.