Responses
well for sure, seme will not let him use the song. therefore, old man is fucked.
seme's entertainment was the one who's in contract with the adaptation of the novel. so it's named after it. now that he passed the bomb, old man, who is now the owner of that entertainment will be the one responsible if they did not follow the contract.
basically, seme let him have the entertainment because he already have the most important thing to have which the right for the song. without it, old men won't be able to proceed with the production. even though, old men already got everything ready, the actors, the set, all... so if he cannot get the song, all of it will go back to zero and since the entertainment that is under the contract is now his, he will be the one to deal with its loss.