lit. only one end of the barber's pole is hot (idiom); fig. one-sided enthusiasm; one party is interested, but the other, not so much; (Note: In former days, street barbers carried their equipment on a pole, with tools and a stool at one end and a brazier at the other.)
trad. 剃頭挑子一頭熱
Also written 剃頭挑子一頭熱【tì tóu tiāo zi yī tóu rè】