Question: Which actress from Love Rain was also known by the mononym Yoona?
Sentence (from "Rainwater tank"): A rainwater catchment or collection (also known as "rainwater harvesting") system can yield 2358 litres (623 gal) of water from 2.54 cm (1 in) of rain on a 93 m (1,000 sq ft) roof.
Relevant evidence: No