Notice of Resignation - Less than 3 Months

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You don’t need to give advance notice at all if you have a valid reason to terminate, as explained here:

Giving Notice of Resignation

It’s not actually an illegal clause, but they may either misunderstand how labor law works or try to mislead you about it (or both). Assuming your job is subject to the Labor Standards Act, there are basically four ways to terminate: employer terminates with advance notice (Art. 11) employer terminates without advance notice (Art. 12) worker terminates without advance notice (Art. 14) worker terminates with advance notice (Art. 15) Art. 11 requires a condition like the employer being in fina…

If you’re terminating without cause (Art. 15), and it’s not permitted by the contract, you need the employer’s consent. The exception is if you have a non-fixed term contract (which you probably don’t, even if it looks like one) or if you’ve already had the job for three years.

If in doubt, ask a lawyer or the labor department.

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EDIT

Replied in a hurry. Let me clarify:

If LSA Art. 15 applies (which shouldn’t be presumed), the notice period is determined by Art. 16.

1. Where a worker has worked continuously for more than three months but less than one year, the notice shall be given ten days in advance.
2. Where a worker has worked continuously for more than one year but less than three years, the notice shall be given twenty days in advance.
3. Where a worker has worked continuously for more than three years, the notice shall be given thirty days in advance.

一、繼續工作三個月以上一年未滿者，於十日前預告之。
二、繼續工作一年以上三年未滿者，於二十日前預告之。
三、繼續工作三年以上者，於三十日前預告之。

If you use Art. 14, there’s no minimum notice period.

If you use Art. 15, and the work period is less than 3 months, there’s no minimum notice period.

Again, make sure you’re terminating the contract properly. They should give you a letter saying you no longer work for them (離職證明書 or 服務證明書). The safe way to terminate is to use a legal deposit letter, but an email should suffice. If the termination is proper, but they don’t give you the letter, they can get in trouble for violating LSA Art. 19.