Asking to leave work on time or taking some time off can be tricky enough. Even trickier is tendering a resignation, which can be seen as the ultimate form of disrespect in the world’s fourth-biggest economy, where workers traditionally stick with one employer for decades, if not for a lifetime.

In the most extreme cases, grumpy bosses rip up resignation letters and harass employees to force them to stay.

Yuki Watanabe was unhappy at her previous job, saying her former supervisor often ignored her, making her feel bad. But she didn’t dare resign.

“I didn’t want my ex-employer to deny my resignation and keep me working for longer,” she told CNN during a recent interview.