@BTS_lover02
Maybe it could be like one person (can be either Nam or Jin) has a crush on the other but due to the popularity/beauty/handsomeness of the latter was scared and insecure to even approach them..
But then something happened to someone they knew which made them realise that FVK it YOLO!!!
And finally they got their number but then chickened out and rather than confessing they ended up sending a very very really lame pickup line in its place....
(Maybe something like..)
I'm no mathematician, but I'm told I'm good with numbers. How about you give me yours so I can prove it ....
And well as they already have the number a conversation ensues?
(i guess that is it...)