According to labor laws and regulations, employees should be compensated for any overtime work. Overtime refers to working beyond the designated work hours. The statement made by your supervisor stating that skill is sold to the company, not time, does not change the fact that overtime work should be paid. In most countries, including China, labor laws require employers to provide overtime pay to employees who work beyond the normal working hours. This applies to both skilled and unskilled workers. Therefore, it is not appropriate for employees to work additional hours without receiving overtime pay. It is essential for companies to prioritize work-life balance and ensure that employees are compensated fairly for any extra time they put into their work.