Don’t think so, Inseon died before their mom got to the hospital + Hyorin would be older than Inhye if she really…
If Inseon is alive she would definitely be much older then Inhye and Hyorin since Inhye and Hyorin are 18 (Korean age) while Inkyung is 29 and Injoo is in her 30s (31). Injoo was 8 and Inkyung was 6 when Inseon was 2-3 years old (stated in episode 3). Inseon also died at 2-3 years old. So it’s not possible for Hyorin to be Inseon even if Inseon is still alive. Inseon would be in her mid 20s if she was living.
https://twitter.com/seunggimylove/status/1571996827402272770?s=46&t=2ShdTeykfXZG7T1DJjDYCw
Nationwide - 5.5%
Seoul Metropolitan - 5.5%
Ep 5 Viewers
Nationwide - 976K
Seoul - 631K
Source 🔗 https://twitter.com/seunggimylove/status/1571991706790424576?s=46&t=2ShdTeykfXZG7T1DJjDYCw
https://twitter.com/seunggimylove/status/1571633752375455744?s=46&t=2t8_tspv7g3CwOD88b4NIQ