I also thought that
I dont think soo. His ex has black hair..
It makes it seem like that especially towards the end you could feel the doom haha I'm praying to the Yaoi gods that Asahi's bro isn't Masato's ex haha otherwise I'm going to seriously be covering my eyes next chapter and hiding in the corner or the comment section. I'm kind of scared lol
I don't think so as they don't have the same name at all also Asahi's bro used be in bad health while Masato's ex was perfectly healthy.
do not tell me that his brother is his ex boyfriend !!!!