You must redeem the Wuthering Waves 2.1 codes before 7:59AM PT/10:59AM ET/3:59PM GMT on February 9th. To be able to redeem, you need to have completed Chapter 1, Act 1, and have reached Union Level 2.

The upcoming Wuthering Waves 2.1 update will release two new 5-star characters from Rinascita, namely Phoebe and Brant. The former will debut in the first phase and the latter in the second.