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There was no relationship between the Liu Sung Dynasty of the Southern Dynasties and the Sung Dynasty of the 12th century; they were not related.
The Southern Sung Dynasty of the 12th century was a continuation of the Northern Sung Dynasty of the 11th century. The Northern Sung Dynasty was destroyed by the Jurchens in 1127.
The Liu Sung Dynasty of the 5th century CE was founded by Liu Yu, thus the emperors' family name was Liu.
The Sung Dynasty of the 12th century CE was founded by Zhao Kwang Yin, thus the emperors' family name was Zhao.
To distinguish these two dynasties, you should remember that the first Sung Dynasty was Liu Sung, while the second Sung Dynasty was Zhao Sung.
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