Arranged Marriage with My Gay Crush AMMGC

After dealing with her break-up wuth her boyfriend, Monica's grandparents shocked her with a news that she needs to marry a family friend for the sake of an unspoken promisd between the parties.
On the other hand, Daru vowed to hate mankind when he saw his boyfriend sleeping with a girl. He then promised to avenge his broken heart by trying to have another lover.
What will happen if two broken people try to fix one another?