According to this report, the KF-21 prototypes #003, #004 are close to being finished and it seems each prototype has different paintings on its tail.
— @Rupprecht_A (@RupprechtDeino) January 23, 2022
Also, #001 is going to have an engine-run test next month, taxi tests in March and maiden flight is planned for late June. pic.twitter.com/oGSD0CZpkV
