ASASSN-21un smoothly fading The light curve resembles a superoutburst of a WZ Sge star. Itoh-san reported time-resolved photometry on two nights (Nov. 10 and 11) without detectable superhumps. YYYYMMDD(UT) mag observer 20211105.5003 14.977zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211107.4573 15.320zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211113.676 16.27C (Hiroshi Itoh) 20211113.842 16.35C (Hiroshi Itoh) 20211116.7049 167:C (Masayuki Moriyama)