Author really like the troupe of "here a cute girl or 2, or 3 for your harem... Pysche!! They are all 1 girl. No need to choose!! But That 1 girl with be annoyed with you for not loving only her~~~".
It happen twice now in Douluo 2, 3 and I think some of his other work have that too
I have not and will not read Douluo 1