轮回

lún huílunhui

1. (neologism) (slang) to respond to a message after a very long delay (pun on 輪迴|轮回[lun2 hui2], the cycle of rebirth) (opposite of 秒回[miao3 hui2])
2. (Buddhism) samsara; cycle of rebirth
3. to recur cyclically; to succeed one another in cycles

Study it in Yanamino