Some question s on Chinese drama Snowfall

so in the ending, the lead vampire died by exposure to the Sun due to no longer protected by the blood amber stone?

And his younger brother went back to his older girlfriend?

Would have been better to have the lead vamp get with older lady, and the 2 young ones together in the end

So did the older vampire really love the girl as like a wife, or more like a little sister?

And didn't the same writer do this series and rattan, so was there an alternative ending ever filmed, one with a good not bitters