Overview:LOOΠΔ Concert [LOOΠΔVERSE] is LOONA's second concert. It was held on February 16–17, 2019 at the Olympic Hall in Seoul, South Korea. All tickets to this event cost ₩110,000(~$98.58 at the time). The event was described as "LOONA, who officially announced their debut with LOOΠΔbirth, is coming back with the new stage LOOΠΔVERSE, 12 girls, three different units, and one group. From LOONA's birth to now, it is time to listen to their future story at their special stage. We are officially inviting you to LOONA's world, the LOOΠΔVERSE." This concert was also set to introduce LOONA's first comeback release, [X X].