Japanese actor Mei Nagano (left) and Kei Tanaka. /Courtesy of social media (SNS) capture

Japanese actress Mei Nagano, 25, is reported to be having an affair with married actor Kei Tanaka, 40. Meanwhile, actor Moo-jun Kim, who is active in Japan, clarified that the rumor about him being Mei Nagano's boyfriend is not true.

According to the entertainment industry on the 23rd, Moo-jun Kim's agency, 9ato Entertainment, said, "Moo-jun Kim and Mei Nagano are just close colleagues," denying the dating rumors between the two.

On that day, the Japanese weekly magazine "Shūkan Bunshun" released photos of Mei Nagano and Kei Tanaka showing physical contact, reporting that the two are in an affair. Kei Tanaka has two children since his marriage in 2011.

"Shūkan Bunshun" also reported that there were indications that Mei Nagano invited a Korean male actor, who is currently appearing in the same drama, to her home. Since Mei Nagano and Moo-jun Kim are appearing together in the TBS Sunday drama "Caster," speculation arose that Moo-jun Kim might be Mei Nagano's boyfriend.

Mei Nagano debuted in the 2009 film "Hard Revenge, Milly Blood Battle" and has since appeared in works such as "Meteor in the Afternoon," "My Story!," "Half, Blue," and "Whenever I Think of This Love, I’m Sure I Will Cry." Kei Tanaka, identified as Mei Nagano's affair partner, gained local popularity through the BL drama series "Aje's Love."

Actor Kim Mujun. /Courtesy of 9ato Entertainment