It seems like Sunggyu will not be renewing his contract.
According to Star News, Sunggyu's contract ends on March 6th. He will not be renewing his contract with Woollim Entertainment, the label that he's been at since 11 years ago when he debuted as the leader of INFINITE back in 2010.
He had renewed his contract with Woollim Entertainment back in 2017 and once in 2019. Hoya left in 2017 and L left in 2019, and Sunggyu will be the 3rd INFINITE member to leave.