Was IU’s ‘Some Day’ plagiarized?

Song ‘Some Day’, sang by popular singer IU, is receiving plagiarism accusations.
Recently on a community site, the idea that IU’s ‘Dream High’ OST ‘Some Day’ was similar to Ash’s ‘To My Man’, released in 2005, was suggested.
IU’s ‘Some Day’ is a song written by singer and songwriter Park Jin Young, and had received much popularity by taking the higher ranks of music sites.
Netizens have been raising strong doubts and suspicions that ‘Some Day’s chorus and ‘To My Man’s chorus are too similar, creating accusations of plagiarism.
Upon hearing the news, netizens have been reacting strongly with comments of, “Park Jin Young plagiarized a song made in Korea?”, “It’s way too similar. Give us an official statement.”, and “Poor IU.“
On the other hand, IU has been receiving positive critiques from the public with her role as Pil-sook in KBS’ drama ‘Dream High’.