What episode is guarding the takeaway brother to kill the boss?

According to the Douban movie query, in the TV series "Guardian", the story of the takeaway brother killing the boss appeared in the first 15 episode. 15 in this episode, Zhang, the takeaway brother, has accumulated resentment because he has been teased by his boss for a long time. During a meal delivery, I lost control and stabbed my boss to death with a knife. This story shows the hardships and pressures faced by the takeaway brother at work, as well as the tragic consequences brought about by personal emotions out of control.