He studied vocal performance at the Korea National University of Arts, and became known to the Korean public after appearing on JTBC's television program Phantom Singer 2 in 2017.

[3] In 2017, Jeong took part in the JTBC audition television program Phantom Singer 2,[4] which aimed to form a male crossover quartet.

Jeong proceeded to the finals with the crossover team Miraclass, which consisted of Julian Jootaek Kim, Kang-hyun Park, and Tain Han [ko], and finished as the runner-up.

[8] The crossover group Miraclass consists of Julian Jootaek Kim, Phillip Jeong, Kang-hyun Park, and Tain Han [ko].

[49] After appearing in Phantom Singer 2 in 2017 and finishing as the runner-up with Miraclass, he started his career as a classical-and-crossover vocalist, individually[50][51] and as part of the crossover group.

[55] This initiative aimed to take diverse cultural performances to smaller cities and rural areas, including at least 30% of underprivileged individuals in the audience.

[57] Traveling to nine cities in 2022 and 2023, they performed opera arias, Korean lyric songs, Spanish and Italian melodies, and musical numbers.

In June 2023, he held his first solo recital, performing pieces including "Mattinata," which he first introduced to the public, arias by Tosti and Bellini, and pop and Korean lyrical songs.

[63] Accompanied by pianist Terry Jun-min Kang, the performance featured piano melodies and Jeong's voice without the aid of a microphone.

Philip Jeong often sings solo or with other vocalists on Open Concert,[76][77][78] a Korean Broadcasting System (KBS) television program.

When he was a freshman at Korea National University of Arts (K-ARTS), a scene of him singing was aired on Documentary Three Days, on which a professor who listened to his song praised him, saying he "sparkles".