Watch abhimanyu birla's introduction promo - he is seen to be burning a paper and a tear falls from his eye. It means the paper is related to him being adopted or being illegitimate.
Else why would they show him burning a photo?
Ak will get to know this truth and support him that's the next track - that's how they will come together..
Or maybe she will marry run away after she sees abhi emotionally vulnerable due to adoption truth
I feel since harsh shows abhimanyu related in him because of birla hospital and stuff they will show Abhimanyu doing his own thing like leaving birla hospital work n stuff. He's also made it clear to his mom that he would have left this house if it was not for his mom but now when he gets to know his mom's truth he will leave her too because of being temporary upset and ak will be the one to hold his hand. Promo says kisika Sahar leke chala nai, jo saath deke chal sake woh kabhi Mila nai and a dupatta drops on him. It's only akshu who will support him.
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