I need to know what did soobin said to woori's mom to make her go away

i thought he got interrupted?

ur son is gay mother

No, while woori was runing to the apartment soobin and woori's mom were talking, unless woori had super velocity It couldnt be possible for him to reach his apartment in 5-10 minutes... because as the manhwa had show us countless of time, worries apartment is far away from his school, he needs to take a bus to get there