三秒梦三年痛七年忘七年痒
[sān miăo mèng sān nián tòng qī nián wàng qī nián yăng]
'Three Seconds Dream, Three Years of Pain, Seven Years of Forgetfulness, Seven Years of Itch' expresses that a short-lived dream can cause prolonged emotional pain which takes years to forget, with old feelings potentially resurfacing after some time (itch symbolizing lingering or revived desire).