Hyoyeon and Tiffany revealed their obsessions on the latest episode of 'Strong Heart', drawing surprises from the guests and MCs on set.

Tiffany was pointed out to have an obsession with a color, and that color was none other than pink! Fans know Tiffany has a love for all things pink, but the members revealed that her obsession with the color is deeper than fans think.

The members commented, "Tiffany won't usually take medicine, but she'll often take that one pink liquid medication (Pepto Bismol)," drawing chuckles from the set. Tiffany admitted that she does really like the color, but that she has started getting into red recently as well. When the other members started to ask "Oh really? Then can I wear the pink outfit next time?" Tiffany quickly shook her head and emphasized that pink is still hers, bringing laughs.

Sooyoung also revealed a quirk about Hyoyeon, saying, "Hyoyeon likes the number 23. You can call her the 23-girl. She asks the manager oppa, 'Buy me 23 tangerines', and says things like, 'I hope we sell 23 million albums'. She even asks if she can get the 23rd off for every month."

Hyoyeon also had the number '32' on her shirt for her 'Oh!' promotions. She admitted, "I really do like the numbers 2 and 3."