[5] On 30 January 2019, Hwang joined Major League Soccer side Vancouver Whitecaps as a Young Designated Player on a two-year contract, with club options for the 2021 and 2022 seasons.

[6] He made his debut for the Whitecaps against Minnesota United on 2 March,[7] and scored his first goal for the side in a 1–0 win over Los Angeles FC on 17 April.

[10] Hwang ranked favorably in statistics for chances created across the Russian Premier League until the first half of the 2020–21 season[11] but suffered coronavirus and heel injury afterward.

[12][13] On 3 April 2022, Hwang's contract with Rubin was suspended until 30 June 2022 according to special FIFA regulations related to the Russian invasion of Ukraine.

He was bought along with Burkinabè centre-back Nasser Djiga and Senegalese winger Cherif Ndiaye in advance of the club's 2023–24 UEFA Champions League campaign.

[23] On 9 December, he won a penalty and scored his first goal for Red Star, helping his team gain a 3–1 victory over Mladost Lučani.

[32] In the 2019 AFC Asian Cup, Hwang showed impressive play and was selected for ESPN's Team of the Tournament.

During a 3–3 draw with Malaysia, he lost possession of the ball in front of his team's penalty box and the mistake was followed by opponent's goal.

[38] J.J. Adams of The National Post noted that Hwang "can play centrally or on the wing, but thrives as an attacking mid — a box-to-box No.