Sejak (Korean: 세작; Hanja: 細雀; lit. 'thin sparrow'), also called dumul-cha (Korean: 두물차; lit. 'second flush tea'),[1] refers to nokcha (green tea) made of young, tender leaves and buds hand-plucked after gogu ("grain rain", 20–21 April) but before ipha ("advent of summer", 5–6 May).[2][3] Also called jakseol (Korean: 작설; Hanja: 雀舌; lit. 'sparrow tongue') as the tea leaves are plucked when they are about the size of a sparrow's tongue,[2]sejak is best steeped at a temperature of 60-70 C.[4]