Zheng Yan, the black-haired twin, is being experimented on.
The twin's little brother is the one who is missing. (Their mother brought their little brother with her when she came to S1... he ran off and this will cause a ruckus in the subsequent chapters)
Hope this helps~
Does that mean the one in the tube is Zheng Yan?
Zheng Yan is in the tube~
Xiao Ke (the kid who's birthday was just celebrated; he has white/silver hair and purple eyes like his two older brothers) is the one missing.
Ke is the one in the test tube being experimented on... but his own father
Thanks everyone
Zheng Yan (black-haired twin) is the one in the test tube~
Xiao Ke (silver-haired, 3rd child) is the kid brother~
Kinda confused. Is the little bother missing? Or black haired seme? And why does the dad have to look so much like mc? There better be a reason