Sports Seoul reported that TVXQ's Yunho and actress Seo Ye Ji have developed from being merely co-stars in the drama 'The Night Watchman's Journal' into lovers.

According to their source, the two makes a beautiful couple and consult each others' about their acting on the drama set at the same time being cautious. They are also said to be dating on their free schedules.

However, both agencies deny the rumor. Seo Ye Ji's representative has confirmed with the actress and states, "Seo Ye Ji told us Yunho is just a close oppa who takes a good care of her and they are not dating."

On the other hand, SM Entertainment reports, "They are just colleagues who appear in the same drama." 

Meanwhile, Yunho and Seo Ye Ji are currently appearing in Monday-Tuesday MBC drama 'The Night Watchman's Journal'.