有一种情义叫放不开有一种离别叫不再来
[yŏu yī zhŏng qíng yì jiào fàng bù kāi yŏu yī zhŏng lí bié jiào bù zài lái]
'There's a kind of relationship named unwilling to let go; There's also a separation named no return'. This describes deep ties and pain involved in partings. When relationships are extremely hard to sever despite inevitable departures, leaving behind sorrow and irrevocability forever impacting those involved.