Cruise trip Shanghai-South Korea-Tianjin-South Korea and Japan

My wife and I will be traveling by cruise starting from Shanghai-South Korea-TJ-South Korea and Japan for 14 days.
1-Will we be eligible for 72 Hours transit visa in Shanghai since we will take a flight from the US and two days later embarking the cruise in Shanghai? That means we will stay two days in Shanghai.
2-Will we be eligible to get a 72 Hours visa in TJ since our cruise ship will dock there for 2,5 days coming form South Korea and leaves for South Korea and Japan? Thanks
Dan