Shinhwa member Dongwan will go on a 100-day anniversary date amid suspicions of a showcase romance with Seo Yoon-ah.

On the 106th episode of Channel A's 'Modern Men's Life - Groom Class' (hereinafter referred to as 'Groom Class') airing on March 13, the scene where Dongwan and Seo Yoon-ah celebrate their 100 days together by fulfilling each other's dating fantasies will be revealed.

The two are seen walking through the city, holding hands affectionately. The 'Grooms' watching their happy moments in the studio envy their naturalness, and Shim Hyung-tak also expresses cute jealousy, saying, "They must not be blood-related."

Dongwan explains, "Today is the 100th day since we met," and then surprises everyone by revealing couple rings on their fourth fingers. The 'Mentor Corps' cheers, "That's amazing!" and even Lee Seung-chul and Jang Young-ran express their joy by dancing with their shoulders.

To celebrate their 100 days, the two decide to fulfill their dream date they've always wanted to try with a lover. 

First, Seo Yoon-ah suggests going to a clothing store to pick out clothes for each other. Dongwan, feeling embarrassed, says, "Actually, I'm known as a fashion terrorist," and sneakily tells Seo Yoon-ah, "You choose your clothes too," making everyone burst into laughter.

Dongwan, who expressed feeling like he was taking the college entrance exam, is asked by Seo Yoon-ah, 

"Then, what kind of clothes do you like your girlfriend to wear?" 

After thinking for a moment, Kim Dong-wan answers "OOO." Seo Yoon-ah, startled by Kim Dong-wan's unexpected reply, blushes and says, "That's sexy!" The curiosity mounts as to what fashion fantasy Kim Dongwan wished for his girlfriend and what clothes he ended up choosing for Seo Yoon-ah.