Half is loss, half is gain - 半是损失,半是收益 (слэш)

“The profiling team has concluded that this person is probably a stalker of Xiao Zhan’s. Stalkers turn on the object of their desire, if their feelings are not reciprocated. Upon rejection, they will likely turn violent and put Xiao Zhan in danger. That’s where you come in.
You have been assigned as his personal protector until the case is solved”.
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Or
PAP officer Wang Yibo suddenly finds himself assigned to a certain idol he has no interest in. Turns out the man is nothing like Yibo expected and now he has to fight a crazy stalker and his own emotions at the same time.
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Translations:
Russian TL can be found here and here