The Japanese single is actually the Japanese version of the song previously released in Korea featuring Sunny Hill's Kota, which you can check out here. With two versions of the songs, even more fans will be able to enjoy the release.
According to SPLUS Entertainment, Kim Hyung Jun will hold a fan meeting and live showcase at Shibuya Public Hall, Tokyo on the 20th. He will also get closer with fans through a handshake and high-touch event in Tokyo on October 21-22. He will then return to Korea on the 22nd.