Loona (group)
Singles

Title
Year
Peak chart positions
Peak chart positions
Sales
Album
Title
Year
KOR
US World
Sales
Album
"Favorite"
2018
—
4
N/A
[+ +]
"Hi High"
2018
—
11
N/A
[+ +]
"Butterfly"
2019
—
6
US: 1,000
[× ×]
"—" denotes releases that did not chart.
"—" denotes releases that did not chart.
"—" denotes releases that did not chart.
"—" denotes releases that did not chart.
"—" denotes releases that did not chart.
"—" denotes releases that did not chart.

Question: When and under which Loona albums were the singles "Hi High" and "Butterfly" released, respectively?
Answer: [+ +] was released in 2018 alongside the second single, "Hi High" and [X X] in 2019 with single, "Butterfly".