<image> The alarm clock has an alarm function. If the alarm is set at 4 o'clock, the alarm will ring when the hands point to 4 o'clock. Mr. Wang has a wall clock and an alarm clock at home. The wall clock keeps accurate time but does not have an alarm function. The alarm clock has a functioning alarm but the knobs for adjusting the clock hands are broken, so it cannot be adjusted. In the evening, when the wall clock shows 12 o'clock, the alarm clock shows 8 o'clock. If Mr. Wang wants to wake up when the wall clock shows 7 o'clock the next morning, at what time should he set the alarm?