[6] He won a major international championship in the Chunlan Cup in July 2023, with a 2–0 victory over Chinese player Li Xuanhao in the finals.

[11][12] A significant controversy in the tournament was around the enforcement of the rule violated by Ke Jie, which was introduced by the Korea Baduk Association in November 2024, well after the LG Cup had already commenced in May.

The change in rules midway through the tournament sparked debate, with critics arguing that it violates sports conventions and renders the final's penalties questionable.

Later in the game, Ke Jie again failed to place a captured stone on the bowl lid, prompting an objection from Byun Sang-il.

[12]Some players expressed shock and anger at Byun's act of reporting his opponent over the trivial matter, stating that his actions "tarnished the image upheld by the predecessors of Go.

Ke Jie informed the referee that he did not oppose the penalty but requested that the game be resumed immediately and paused only after Byun had made his move.

The player whose turn it is must think and record the point where they plan to play on a designated piece of paper, which is then sealed and handed to the referee.

"[18] He also told reporters that he was unaware of the rule before the referee announced Ke Jie's violation for failing to properly handle captured stones.