Polylactic acid resin and packaging film comprising the same

A polylactic acid resin, comprising:

• a hard segment comprising a polylactic acid repeating unit of the following Chemical Formula 1;
• and
• a soft segment comprising a polyurethane polyol repeating unit in which polyether polyol repeating units of the following Chemical Formula 2 are linearly linked via a urethane bond,
• wherein the polylactic acid resin has an organic carbon content (% Cbio) from the biomass source defined by the following Equation 1 of 60 wt % or more:
• % Cbio=(Weight ratio of 14C isotope to 12C isotope among the total carbon atoms contained in the polylactic acid resin)/(Weight ratio of 14C isotope to 12C isotope among the total carbon atoms contained in a standard material from the biomass source) [Equation 1]
• in the Chemical Formulae 1 and 2, A is a linear or branched alkylene of 2 to 5 carbon atoms, m is an integer of 10 to 100, and n is an integer of 700 to 5000.