when they are in the classroom,krystal see that suzy is always staring at myungsoo so she wants to talk to myungsoo to date her and make her happy even she know that he had a bit feeling for myungsoo he wants her bestfriend suzy to be happy even it it painful 

(recess)

myung can I talk you,krystal said

yes sure,myungsoo said 

in private, krystal said. and myungsoo follow her they went to the corridor and no one is there except for suzy

myung,can I ask you a favor,krystal said almost tearing up cause she know that he have a bit feelings for myungsoo but he wants her bestfriend to be happy

yes sure,myungsoo said

can you date suzy and make her happ,krystal said looking to the floor

krystal are you using me to make your best friend happy and even date her,myungsoo said almost shouting

yes I want you to date and make her happy because she save me from the tragic event that I am almost going to die,and she love,krystal said tearing down

yes I will do that but do me a favor too,myungsoo said rubing her tears.

yes,anything,krystal nodded

if I make her happy you will give me a chan