On January 4, 2017, Jun.K released a surprise music video for his song “Your Wedding”, for his return as a solo artist in Korea. The music video stars 2PM’s Nichkhun and TWICE’s Nayeon. “Your Wedding” is a pre-release for Jun.K’s self composed album titled 77-1X3-00. On January 12, 2017, Jun.K released the Korean album 77-1X3-00, as well as the music video for its title track, “No Shadow”.
Jun. K’s 2nd concert tour “Love Letter” and 3rd concert tour “No Shadow” ranked in each year’s top 10+1 best concerts in Japan by Yahoo in a row, for having the most impressive two live concert tours of 2015 and 2016 making him the only K-pop artist on the lists.