Stolen from allkpop:
QuoteOn March 25, Woollim Entertainment revealed Jangjun had been diagnosed positive for COVID-19. The label stated, "On March 24, Lee Jangjun checked he tested positive for COVID-19 through a self-test kit, so he took a PCR test. He tested positive for COVID-19 today through a PCR test."
Woollim Entertainment further confirmed the Golden Child member had completed 3 doses of the COVID-19 vaccine, and he only has symptoms of a mild cold. Jangjun will be recovering in self-quarantine, and he'll be taking a hiatus from scheduled activities for the time being.
Get better soon Jangjun!