Dude if he went to the airport keith will obviously know
I know but at least he will be far away, before drugging keith he should make a escape plan, like buying ticket, planning the route like you can go to china, and then without taking a plane crossing the border to other country by land transportation, which is harder to track, isnt keith find it hard to track yeonwoo even he still in korea? So i think its far more difficult for him to find yeonwoo if he oversea, i believe he actually care for the baby, and being on the intense run like in korea will strain his body more, so oversea escape still far more better plan, and we all know yeonwoo have money to go with that plan.
Why not going overseas in the first place? I thought he already in another country when next chapter start (dissapointed lol), he is making the situation more complicated for himself.