On January 4, 2016, Ravi revealed the first pre-release to his mixtape R.ebirth, with the track 'Where Should I Go' featuring Microdot. 2016–2019: R.ebirth, DamnRa, solo debut with R.eal1ze, Nirvana, and R.ook Book On December 31, 2015, Ravi dropped a teaser on his Twitter and Instagram accounts for his first mixtape R.ebirth with tracks composed, written and produced by himself. In December 2015, Ravi was featured in the ballad girl group Melody Day's single 'When It Rains' ( Korean: 비가 내리면), as part of their Winter Ballad Project.

On the same day VIXX LR held their first showcase for Beautiful Liar at Yes24 Muv Hall in Seoul′s Mapo-gu.

Their debut mini album, Beautiful Liar, was released on August 17, 2015. VIXX LR was confirmed by Jellyfish Entertainment to be VIXX's first official sub-unit composed of main rapper Ravi and main vocalist Leo. A video trailer of VIXX LR was then revealed. As time went by, members of VIXX disappeared until finally only Leo and Ravi were left behind, which caused fans to speculate that it meant another comeback for all six members. On August 7, 2015, Jellyfish Entertainment released a video trailer on VIXX's official website after a mysterious countdown with a silhouette of VIXX's last special album Boys' Record. Ravi was featured as a rapper in Rain's Chinese song 'Diamond Love' from the soundtrack of the Chinese drama Diamond Lover (克拉戀人). In 2015, after much deliberation, Ravi became a contestant of Mnet's television rap competition series Show Me the Money 4 but was eliminated in the second round. Ravi also appeared in the music video for the single. In 2014, Ravi collaborated with American artist Chad Future with 'Rock the World' from Future's first mini album.

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