When he woke up, technician Li Yan became a steam boiler operator in 1970.

Faced with an era when families were penniless and coal and passion were burning together, others were thinking about how to shout slogans, but Li Yan was only thinking about how to make the boiler burn more vigorously and make life with his wife and children more comfortable.

Others see him as a big, rough guy sweating profusely, but he is actually the most leisurely "invisible boss" in the maintenance depot.

Using Newtonian mechanics to heat boilers? Coal consumption dropped by 30%, a feat the experienced boiler owner called a miracle.

· Make a home heater out of scrap parts? Keep your whole family warm during the coldest days of winter.

Giving a locomotive a "physical examination"? Fault hazards are easily identified, and safety production champions are easily awarded.

The trains that crisscrossed the country formed his information network, and the diverse passengers formed his personal connections. He offered guidance to returning educated youth, provided timely assistance to struggling experts, and with a glass of wine and a few prophecies, he paved a leisurely and stable path for himself amidst the whirlwind of the times.

When the spring breeze of reform blew, everyone was surprised to find that this train driver who always smiled had already stood at the top of the wave.

This is a leisurely daily life under the roar of steam, and also a legend of an ordinary person gently embracing an era with knowledge.