
The hair colour is just to show the ambiguity n the unknown identity of their dads. I don't even believe it's their actual hair colour, it's just an art technic used instead of ugly blurring the whole face. N the flaw in your theory is that jy's mother has been looking for her lover the whole time and by now she should've easily found him if he was just in jail. N I think mo's dad is in a jail nearby or at least in a few cities away and is jailed since mo was a kid (should have found him a long time ago with that delay, even with a false identity). To add she has the help of Jian's grandpa even if sometimes they are not on the same wave length. N for the timeline and place, JY happens to live near Mo's city since they go to the same school and he hasn't move during childhood since he was always with zzx, and so is mo with she li. So it can be a possibility that there would be an adultery involved n they would be step bros but it's still very unlikely based on the info we have rn.
i genuinely believe that jian yi’s father is also little mo’s father, the hair colour in uncanny and the fact they both disappeared at the same time?? well jian yi’s father was reported “missing in action” where jyi mother was pregnant w him which could be led to believe that he changed his identity and got w mo’s mumma and then got jailed for “murder” that mo says was a false charge and that his father is innocent. THINK ABOUT ITT THE FLASHBACK W MO’S DAD HIS HAIR IS LIGHT, HIS MOTHERS HAIR IS A DARKER SHADE OF RED COMBINED ITS MO’S LIGHT HAIRED SHADE RED. i was re-reading 19 days and this just occurred. anyone have any thoughts?