Irene and Yumi
Sister's Ship
~ Since they are childhood friends ,there's no doubt that among the members Yumi is close to Irene and this is the popular ship in the group.Their bonding time is go to Bukchon district 8 to do sightseeing and even visit the folk museum and cooking
Seulgi and Yumi
Best Friend's Ship
~ Yumi and Seulgi is the 2nd closest member because of similarities like dancing,they do friendly dance battle sometimes and they met at Maple Tree House which is a BBQ Restaurant,their bonding time is also dancing and eating
Wendy and Yeri
Sister's Ship
~ Yumi takes care of Wendy when she injured and gives her advice if there's a problem,they met outside SM building . Yumi teach her Chinese and Japanese words since Wendy like to learn this languages for their fans,they speak eng when they are alone and their bonding time is singing western songs, cooking and baking
Joy and Yumi
Best Friend's Ship
~ They already met before Joy casted in 2012,they met at Baskin Robbins and their bonding time is eating ice cream and watching movies. She is the first member who knows that Joy is in a relationship with Crush
Yeri and Yumi
Sister's Ship
~ Since Yeri is the maknae,it's natural that Yumi takes care of her. Yumi makes sure that Yeri do her homework ,Yumi is the first member she met and their bonding time is composing and answering math questions