Vietnam legion hotel

It should be the novel "Honor". The protagonist is Bao Yulin, not some Vietnamese children I met in Hong Kong, but a prison camp in Vietnam, which strengthened the guards (remember that the protagonist was injured in a field hospital, captured by the Vietnamese, and the people who organized the prison camp escaped, as if killing the sister of the female guard, and all actions against him were blocked). The female guard later sneaked into Hong Kong.