A piano technician, someone who maintains and repairs the "Kings of Instruments", is a profession few pursue today. It does not offer high income, while each maintenance session take times, possibly up to six hours or more for tuning and adjustments, depending on the condition and “ailment” of each piano.

What was initially planned as a 3-month journey by Dr. Hattori Tadashi in 2002 eventually extended to over 20 years, taking away much from him but bringing light to over 60,000 people in Vietnam. He didn't take any salary, even using his own pocket money to cover expenses for financially-struggling patients and to support some Vietnamese hospitals with ophthalmic medical equipment.

Remote consultation, examination, and treatment with the "Doctor for Every Family" (DFEF) software has created a healthcare network without limitations between different levels. This marks a significant milestone in the digital transformation in the medical field.