The South Korean international was signed by Celtic under Ange Postecoglou but struggled to make the starting XI, with Kyogo the preferred choice.
His opportunities were limited further after Brendan Rodgers took charge.
He was sold to Genk in 2024 and began to make more of a name for himself, scoring 22 goals across two campaigns.
This commendable form put Stuttgart of the Bundesliga on high alert, and they were reportedly set to dish out a hefty €28 million to secure his signature.
However, the deal fell through due to issues flagged during the medical.
In February of this year, the striker made a €14 million switch to Besiktas, where he has begun his career in Turkey with great success, scoring seven goals in ten games.
With his impressive performances, it's reported that he has now caught the eye of multiple clubs, including English Premier League giants Manchester United and Tottenham Hotspur, according to reports in Turkiye Gazetesi.
He only made the move to Besiktas a mere two years after being sold by Celtic for £4.5m.