Who do bạn think is the mother of Kai's son Gou?

I'm so annoyed not to know who it is!! When bạn look at Rin bạn can obviously see that's Mariah's and Ray's daughter. But Makoto and Gou…

I guess Takao Aoki doesn't want to disappoint us những người hâm mộ when he reveals, who is gonna be Hilary's Husband…