Few month later

 seohyun: oppa can you help me

 Kai: ok what 

 seohyun: pretend that I am going out with you but no kiss

 Kai: ok

 seohyun: start now

 then luhan came over

 luhan: what are you doing

 seohyun: not thing ( she was holding Kai's hand

 Kai: how about we go on a date today

 seohyun: ok 

 luhan: yah seohyun

 seohyun: what do you want

 Kai: come on seohyun

 seohyun: coming

 then they went out 

 seohyun: hahaha he fall for the trick

 Kai: never though that hyung are that easy to fall for the trick

 chanyeol: what are you guys doing

 seohyun: I'm giving luhan a surprise so me and Kai is pretending to be a couples

 chanyeol: did hyung fall for it

 seohyun : yes but don't tell him ok

 chanyeol: ok

 then 

 chanyeol: hyung what happen ( acting like he don't know noting)

 luhan: seohyun is going out with Kai 

 chanyeol: what she cheat on you

 luhan: I don't know I will talk to her later 

seohyun: I'm going to tell my unnie and you go tell to others but don't tell luhan

 Kai: ok

 Seohyun: unnie I need to tell you some thing

 taeyeon: what

 seohyun: I'm having a surprise for luhan so I'm pretending to go out with Kai so don't tell luhan about my surprise

 yoona: what is your surprise

 seohyun: sorry unnie I can't tell you

 hyoyeon: ok we will try to keep the surprise away from luhan but don't go to deep I'm scared that luhan will hate you

 seohyun: ok don't worry

 Kai: hyung seohyun is planting a surprise for luhan so we are pretend to go out but don't tell hyung

 suho: oh really 

Kai: yes so please don't tell hyung

 sehun: did luhan hyung fall for it

 Kai: yes 

lay: oh look like it fun

 luhan: seohyun are you cheating on me

 seohyun: no what

 luhan: I saw you going out with Kai

 seohyun: so what

 luhan: I can't believe you cheat on me

 then luhan walk away

 seohyun: ok 

then seohyun went home to see if luhan was there

 seohyun saw luhan packing his stuff

 seohyun: what are you doing

 luhan: go back to my house

 seohyun: so now you want me to live alone

 luhan: you have Kai 

 seohyun: Kai wow look like you really are easy

 luhan: easy what

 seohyun: ok I'm not cheating on you and I'm Pergnant 

Luhan : you what

 seohyun: I'm Pergnant you what we to look miserable for nine month

 luhan: I'm going to be a father

 seohyun: yes I'm sorry 

luhan : nono it fine I'm going to be a father

 seohyun: yes 

then luhan went to hug seohyun

 seohyun: so are you stay what to move

 luhan: nono I'm staying here and tomorrow you are going to marry me

 seohyun: do you want a Boy or a girl

 luhan : I want a boy and a girl

 seohyun: so you want two kids

 luhan: yes

 seohyun: ok let go sleep I'm tired

 luhan : ok

 tomorrow 

 seohyun: I need to tell you something

 yuri: what

 seohyun: I'm getting married and I'm going to be a mother

 sunny: really seohyun congrats 

Seohyun: thank you unnie

 sooyoung: so that was your surprise

 seohyun: yes and can you guys come help me pick a dress for the wedding

 sunny: ok

 seohyun: oppa come on hurry up we need to go for the wedding

 luhan: coming

 then luhan went down and hurry up went to the wedding

 luhan: ok babe go change

 seohyun: ok

 then seohyun went to change and seohyun's wedding dress look like this

 Then seohyun went down to aisle everyone was clapping

 luhan eyes went wide 

(skip some part)

luhan do you take seohyun as your wife

 luhan: I do

 seohyun do you take luhan as your husband 

Seohyun: I do

 now you may kiss the bride

 then luhan kiss seohyun and everyone clap