Question: When was the South Korean musician, singer-songwriter, record producer and actor who was the most notable front man of the band that sang 2gether born? 
Sentence (from "2gether (CNBLUE album)"): After ending domestic promotions for "Can't Stop" (2014), the band concentrated on individual activities; most notably, frontman Jung Yong-hwa released his debut solo album "One Fine Day" (2015) in January.
Relevant evidence: No