In an inconspicuous corner, Walt and Jesse reached an agreement.Walt makes the drugs and Jesse sells them.This division of labor seems clear and harmonious, but behind it lies deep dangers and secrets.

Walter began chemotherapy, which he lied about being paid for by Elliot.However, the side effects of chemotherapy gradually appeared, and he suddenly felt unwell during a chemistry class at school and had to leave the classroom to go to the toilet to vomit.Student Skyler becomes suspicious of his whereabouts, but Walter excuses himself by taking a walk.

During the process of making poison, Walter's health deteriorated.A coughing attack forced him to leave the RV and go outside for some fresh air.Jesse noticed something strange about Walter, and he speculated that the reason why Walter worked so hard to make drugs was to prepare for his wife and children's death.

At the same time, Hank and his colleagues found a mask in the desert and tracked it to Walter's high school.Hank tells Walter that the mask was stolen from the school supply room.They found more items missing from the supply room and suspected someone was stealing and making drugs in the school.Unfortunately, they mistakenly arrest Hugo, the school's janitor.Walter knew Hugo was innocent, but he could not speak out.

Jesse gives the dividend to Walter, but Walter thinks the money is too little.He suggested contacting a dealer, and Jesse revealed there was a man named Tuco to contact.Tuco agreed to buy it after inspecting the goods, but required payment and delivery.However, when Jesse handed the goods to Tuco, Tuco became angry and beat Jesse up.After learning about this, Walter decided to meet Tuco in person.

The next morning, Walter shaved his head and found Tuco's hiding place with a bag of things.He demanded $50,000 from Tuco for the amphetamines and Jesse's medical expenses.Tuco refused, so Walter took out a crystal from the bag and told Tuco that it was not drugs, but mercury.Walter threw the crystal out, and it exploded instantly, making everyone in the room dizzy.After threatening to throw away the entire bag, Tuco agreed to pay.